Traffic Leaving Enterprise Network Cont

Managed CE

Managed CE

Output Policy

Classification / Marking / Mapping

WRED

[Shaping]

Input Policy <Not required>

Unmanaged CE

Unmanaged CE

Unmanaged CE

Output Policy <irrelevant>

Input Policy

Classification / Marking / Mapping

Policing

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For traffic leaving the CE router, the figure illustrates the different QoS mechanisms that are commonly implemented at the CE and PE routers, depending on whether the CE is managed by the service provider.

For unmanaged CE, the CE output policy is managed and configured by the enterprise customer; therefore, it is irrelevant to the service provider. At the PE input interface, the service provider will have a policy to classify, mark, or map the traffic. The service provider also typically implements traffic policing to rate-limit the input traffic rate from the enterprise customer, so that the traffic rate does not exceed the contractual rate as specified in the SLA.

For managed CE, the CE output policy is managed and configured by the service provider. The service provider typically has an output policy on the CE router to classify and mark the traffic exiting the CE router. LLQ and/or CBWFQ, and WRED, are used for congestion management and congestion avoidance. To compensate for speed mismatch or oversubscription, traffic shaping may be required. To improve link efficiency, LFI and cRTP are used.

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